Defensive publication

ABSTRACT

DISCLOSED IS A PROCESS FOR POWDER COATING ELECTRICALLY NONCONDUCTIVE SUBSTRATES, WHICH CAN WITHSTAND A TEMPERATURE WITHIN THE RANGE OF ABOUT 375*F. TO ABOUT 500*F. WITHOUT DEFORMING, CHARRING, AND THE LIKE, IN SELECTED AREAS. SUITABLE SUBSTRATES ARE FABRICS, PAPER PRODUCTS, GLASS, CERAMICS, THERMOSETTING RESINS SUCH AS PHENOLICS, UREAFORMALDEHYDE AND UREMELAMINE RESINS, THERMOSETTING POLYESTERS AND CRYSTALLINE LINEAR POLYESTERS SUCH AS POLYETHYLENE TEREPHTHALATE. IN THIS PROCESS A GROUNDED, ELECTRICALLY CONDUCTIVE, SHAPED COATING IS FORMED ON A PORTION OF THE AREA OF THE SIDE OF AN ELECTRICALLY NONCONDUCTIVE, HEATABLE SUBSTRATE. BOTH THE COATED PORTION OF THE SIDE AND A PORTION OF THE REMAINING AREA OF THE SIDE ARE THEN CONTACTED WITH CHARGED POLYMER PARTICLES AND THE CHARGED POLYMER PARTICLES ADHERE ONLY TO THE ELECTRICALLY CONDUCTIVE SHAPED COATING AND NOT TO THE REMAINING AREA OF THE SIDE OF THE SUBSTRATE. THE COATED PORTION OF THE SIDE IS THEN HEATED TO FORM THE POLYMER PARTICLES INTO A COATING WHICH IS FUSED TO THE GROUNDED, ELECTRICALLY CONDUCTIVE SHAPED COATING AND IN THE SAME SHAPE AS GROUNDED, ELECTRICALLY CONDUCTIVE SHAPED COATING. THE POLYMER PARTICLES CAN BE COMPRISES OF CELLULOSE ESTER, POLYOLEFIN, POLYESTER OR MIXTURES THEREOF. IN ONE PARTICULAR ADVANTAGEOUS EMBODIMENT THE POLYMER CAN BE COMPOSED OF A MIXTURE OF POLY (1,4-CYCLOHEXYLENEDIMETHYLENE TEREPHTHALATE/ISOPHTHALATE) AND CELLULOSE ACETATE HUTYRATE.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969. 869 0.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification. including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Oiiice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED SEPTEMBER 11, 1973 T914,001 POWDER COATING PROCESS Peter M.Grant, Hemlock Park 37663, and Herbert R.

Lyon, 128 Dahlia 37664, both of Kingsport, Tenn.

Filed Feb. 23, 1972, Ser. No. 228,760 Int. Cl. B05b 5/02; B44d 1/094 US.Cl. 117-17 No Drawing. 8 Pages Specification Disclosed is a process forpowder coating electrically nonconductive substrates, which canwithstand a temperature within the range of about 375 F. to about 500 F.without deforming, charring, and the like, in selected areas. Suitablesubstrates are fabrics, paper products, glass, ceramics, thermosettingresins such as phenolics, ureaformaldehyde and ureamelamine resins,thermosetting polyesters and crystalline linear polyesters such aspolyethylene terephthalate. In this process a grounded, electricallyconductive, shaped coating is formed on a portion of the area of theside of an electrically nonconductive, heatable substrate. Both thecoated portion of the side and a portion of the remaining area of theside are then contacted with charged polymer particles and the chargedpolymer particles adhere only to the electrically conductive shapedcoating and not to the remaining area of the side of the substrate. Thecoated portion of the side is then heated to form the polymer particlesinto a coating which is fused to the grounded, electrically conductiveshaped coating and in the same shape as grounded, electricallyconductive shaped coating. The polymer particles can be comprised ofcellulose ester, polyolefin, polyester or mixtures thereof. In oneparticularly advantageous embodiment the polymer can be composed of amixture of poly (1,4 cyclohexylenedimethyleneterephthalate/isophthalate) and cellulose acetate butyrate.

